Method and system for the localization of a mobile WLAN client

Details Method and system for the localization of a mobile WLAN client Method and system for the localization of a mobile WLAN client

2011-07-05

2011-07-05

Appiah, Charles N (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S456200, C370S338000

Reexamination Certificate

active

07974632

ABSTRACT:
A method and a system for the localization of a mobile WLAN client, located within a WLAN network of multiple WLAN stations. Static reference points are ascertained by measuring field strengths of the WLAN stations at spatial coordinates, aided by WLAN client(s), and assignment of the measured field strengths to the spatial coordinates in terms of data records. Self-learning ascertainment of further dynamic reference points is obtained by measuring field strengths of the WLAN stations, aided by WLAN client(s) moving through the region of the network, and assignment of the measured field strengths in terms of data records to the respective spatial coordinates calculated for this purpose, in the database server. This may be done to localize a WLAN client by selecting a plurality of nearest matched data records of static and dynamic reference points whose subsequently calculated center of gravity corresponds to the estimated position of the WLAN client.

REFERENCES:
patent: 7212828 (2007-05-01), Hind et al
patent: 7250907 (2007-07-01), Krumm et al.
patent: 2002/0095493 (2002-07-01), Byrnes
patent: 2003/0023726 (2003-01-01), Rice et al.
Paramvir Bahl and Venkata N. Padmanabhan, “Radar: An IN-Building AF-based User Location and Tracking System”, 2000.

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